Right there is a good reason to bring the jury back and start questioning them about their behavior ~ and sending the guilty ones to jail to depurge themselves!
They probably saw many media in the courtroom so that may be a hint of the sensationalism.
And get real, the jury had no motive to release this woman other then the instructions by the court. The anger over this case is being misdirected and should be aimed at the prosecution. They overreached and overplayed.